Nesaulax protuberator Li & van Achterberg & Yan & Zhu & Chen 2026, sp. nov.

Nesaulax protuberator Li & van Achterberg sp. nov. Figs 3, 4 Type material. Holotype. ♀, China, • Hainan Prov., Mt. Diaoluo, 18 ° 40 ' 3.72 " N, 109 ° 53 ' 54.3 " E, 31. X- 30. XI. 2020, Chen Longlong, No. HN 17, LSX 953, 2022001 (CDNU). Diagnosis. Details are in the key to the species of Nesaulax Roman, 1914. Description. Holotype, ♀, length of body 13.0 mm, of fore wing 11.0 mm, of ovipositor sheath 23.5 mm. Head. Antenna incomplete, with 59 segments remaining; median segments 1.5 times longer than wide; third segment 1.3 and 1.4 times longer than fourth and fifth, respectively, the latter 1.8 times longer than wide; clypeus height: inter-tentorial distance: tentorio-ocular distance = 6: 19: 11; face coarsely punctate and sparsely setose (Fig. 4 g); eye height: shortest distance between eyes: head width = 18: 17: 34; frons smooth, strongly concave behind antennal sockets (Fig. 4 h); vertex smooth and with few setae; minimum distance between posterior ocelli: minimum diameter of elliptical posterior ocellus: minimum distance between posterior ocellus and eye = 1: 1: 3; in dorsal view length of eye 1.4 times temple; temples gradually narrowed behind eyes, rounded posteriorly, largely smooth and with few short setae (Fig. 4 h). Mesosoma. Length of mesosoma 2.1 times its height (Fig. 4 c); propleuron and pronotum densely setose anteriorly (Fig. 4 c); mesopleuron and metapleuron smooth and glabrous (Fig. 4 c); notauli impressed on disc anteriorly, becoming rather shallow posteriorly (Fig. 4 d); mesoscutum smooth and glabrous, middle lobe weakly convex (Fig. 4 d); scutellar sulcus moderately wide and deep, with short crenulae (Fig. 4 d); scutellum largely smooth, sparsely punctate and setose posteriorly; metanotum convex medially, without median carina anteriorly; propodeum smooth except with two short carinae latero-posteriorly, with some short setae medially, and densely setose laterally (Fig. 4 d). Wings. Fore wing (Fig. 4 a): pterostigma slender, 4.4 times longer than wide; SR 1: 3 - SR: r = 31: 19: 3; 1 - SR + M evenly curved; second submarginal cell parallel-sided apically; 2 - SR: 3 - SR: r-m = 8: 17: 5; m-cu 2.6 times as long as 2 - SR + M; cu-a weakly postfurcal. Hind wing (Fig. 4 b): 1 r-m straight; SC + R 1: 2 - SC + R: 1 r-m = 30: 8: 19. Legs. Length of fore femur: tibia: tarsus = 11: 12: 21; length of hind femur: tibia: basitarsus = 27: 51: 24; length of femur, tibia and basitarsus of hind leg 6.0, 14.6 and 13.3 times their maximum width, respectively; hind tibial spurs 0.2 and 0.3 times as long as hind basitarsus; hind tibia and tarsus densely bristly dark brown setose (Fig. 4 f). Metasoma. First tergite relatively slender, 1.9 times longer than its apical width, nearly parallel-sided, median area rather developed, coarsely sculptured (Fig. 4 j); first tergite with six long longitudinal rugae on median area, and with developed lateral carinae, lateral grooves narrow (but widened anteriorly) and weakly crenulate (Fig. 4 j); apical width of second tergite 1.1 times its median length; triangular medio-basal area of second tergite rather large, apex acute and almost reaching posterior margin of tergite, but not attached to a medio-longitudinal carina, grooves of medio-basal area strongly crenulate, lateral longitudinal grooves deep, widened and crenulate; second tergite coarsely sculptured, largely with longitudinal and oblique striae including medio-basal area (Fig. 4 e); second suture rather deep and wide, crenulate, slightly curved upward laterally, nearly straight medially; antero-lateral areas of third tergite convex and distinct; third tergite largely with longitudinal and oblique striae except for posteriorly; antero-lateral areas of fourth tergite rather convex, fourth tergite largely smooth but with longitudinal and oblique striae anteriorly and medially (Fig. 4 e); fifth – seventh tergites smooth (Fig. 4 e); hypopygium acute apically; ovipositor sheath 2.1 × as long as fore wing. Colour. Head and mesosoma mostly reddish yellow (Fig. 3); antenna largely black, except for scapus yellowish brown with a black longitudinal stripe laterally (Fig. 4 i), and apical segments yellowish (Fig. 3); mandible apically black; hind leg and claws black (Fig. 4 f); metasomal tergites and ovipositor sheath black (Figs 3, 4 e); wing membrane brown, fore wing with irregular pale brown stigmal spot, pterostigma yellowish brown, and veins blackish brown (Figs 4 a, b). Distribution. China (Hainan), Thailand, Malaysia, India. Etymology. Named after the apico-ventrally protruding scapus: “ protuberator ” is Latin for “ protruding ”.